You can try to reset the modem by pressing the reset button fo it for 15 seconds while the power is ON or better call your ISP and let one of tech walk you through in checking what is the problem of the modem and reconfiguring it back....

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Not quite sure I understand this. Your modem (do you mean modem as in dial-up or do you mean ADSL router as in broadband?) works in one room but not in another. But your desktop works when plugged into the same jack!
please confirm that you are using broadband and not dial-up as the above makes no sense. Broadband is tied to a specific phone line & number. Dial-up works on any phone line.

think the new ones are capable of being wireless. if your laptop has wifi it will work. if not. should also have a lan connector to be wired. or if CLEAR.com is available in your area you can have multiple connections with them. we can setup your account if your address is verified by there.system. and we give you $45 back on new activations. just ask me how.

If the Internet light is off then there is a problem with the phone line to the ADSL modem or the modem is faulty or there is a problem at the telephome exchange.
Disconnect the phone cable at the ADSL modem and connect a phone handset to this cable - check for a dial tone and that you can dial out.
If you don't get a dial tone, use a different or new phone cable.
If the phone line is OK then : -
Ring your ISP to get them to test your connection to your ADSL
modem.

i got the same problem, quick solution for now is to set the wireless to 802.11b <----, slower local network but shouldnt notice to much on ur internet
still not sure why 54Mbits drops the internet on that modem might need a firm ware upgrade

It is possible but it may not work as a router (2 wire 270). The 2wired router only has a phone port and ethernet/usb for computer connection. So if you will connect the roadrunner modem to the 2wired, you can connect it to the ethernet port of the 2wire, but the 2 wire will not function as a router any more. It will work just like a wireless bridge. This one setup that you can.